linux-kernel - Re: [PATCH 11/33] iris: vidc: add helpers for memory management

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Date:   Tue, 15 Aug 2023 00:35:12 +0530
From:   Dikshita Agarwal <quic_dikshita@...cinc.com>
To:     Bjorn Andersson <quic_bjorande@...cinc.com>,
        Vikash Garodia <quic_vgarodia@...cinc.com>
CC:     <stanimir.k.varbanov@...il.com>, <agross@...nel.org>,
        <andersson@...nel.org>, <konrad.dybcio@...aro.org>,
        <mchehab@...nel.org>, <hans.verkuil@...co.com>,
        <linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH 11/33] iris: vidc: add helpers for memory management



On 7/28/2023 9:58 PM, Bjorn Andersson wrote:
> On Fri, Jul 28, 2023 at 06:53:22PM +0530, Vikash Garodia wrote:
>> diff --git a/drivers/media/platform/qcom/iris/vidc/src/msm_vidc_memory.c b/drivers/media/platform/qcom/iris/vidc/src/msm_vidc_memory.c
> [..]
>> +static const struct msm_vidc_memory_ops msm_mem_ops = {
>> +	.dma_buf_get                    = msm_vidc_dma_buf_get,
>> +	.dma_buf_put                    = msm_vidc_dma_buf_put,
>> +	.dma_buf_put_completely         = msm_vidc_dma_buf_put_completely,
>> +	.dma_buf_attach                 = msm_vidc_dma_buf_attach,
>> +	.dma_buf_detach                 = msm_vidc_dma_buf_detach,
>> +	.dma_buf_map_attachment         = msm_vidc_dma_buf_map_attachment,
>> +	.dma_buf_unmap_attachment       = msm_vidc_dma_buf_unmap_attachment,
>> +	.memory_alloc_map               = msm_vidc_memory_alloc_map,
>> +	.memory_unmap_free              = msm_vidc_memory_unmap_free,
>> +	.buffer_region                  = msm_vidc_buffer_region,
> 
> Will there ever be more than one implementation of the
> msm_vidc_memory_ops?
> 
> Unless there's a really strong reason, just call the functions directly
> without the function pointers and call_mem_op(), this will be slightly
> faster, but more importantly it allows for much faster navigation of the
> code base.
> 
That's right, implementation of these APIs won't change for different platform.
Will remove the ops and use direct function in next version.

Thanks,
Dikshita
> Regards,
> Bjorn